dash-turbine-maintenance: Remove pip update in predeploy

Former-commit-id: 9ed511e

Author: xhlulu

apps/dash-turbine-maintenance/app.json

@@ -0,0 +1,15 @@
+dash==1.19.0
+dash-bootstrap-components==0.11.3
+dash-core-components==1.15.0
+dash-daq==0.5.0
+dash-html-components==1.1.2
+dash-renderer==1.9.0
+dash-table==4.11.2
+matplotlib==3.3.4
+numpy==1.19.5
+pandas==1.1.5
+plotly==4.14.3
+scikit-learn==0.24.1
+scipy==1.5.4
+xgboost==1.3.3
+gunicorn